Read and alter audio data for each participant

Managing individual participant audio data.

Read time 1 minute

Last updated 8 months ago

The

pf_on_audio_unit_before_recv_audio_mixed

callback provides a parameter with type

vx_before_recv_audio_mixed_participant_data_t *

called

participants_data

. An example of how to use this pointer to access an array of separate participants’ audio data is shown in the code sample below.

Note

If you are upgrading your Vivox integration from v5.10, 5.11, or 5.12 be aware that the unique identifier for participants has changed in v5.13 and later versions. If you were using

participant_display_name

previously you need to change it to

participant_uri


void SDKSampleApp::OnBeforeReceivedAudioMixed(const char *session_group_handle, const char *initial_target_uri, vx_before_recv_audio_mixed_participant_data_t *participants_data, size_t num_participants){    std::string example_uri = “example_uri”;    // Iterate over the multiple audio streams    for (unsigned int i = 0; i < num_participants; i++) {        auto &data = participants_data[i];         int channels_per_frame = data.channels_per_frame;        std::string participant_uri = data.participant_uri;         if (participant_uri == example_uri) {            for (unsigned int f = 0; f < data.pcm_frame_count; f++) {                for (unsigned int c = 0; c < channels_per_frame; c++) {                    // Use / modify the audio data. Here we're simply dividing the samples by 2.                    data.pcm_frames[(f * channels_per_frame) + c] /= 2;                }            }        }    }}

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